Paper-to-computer interfaces

Details Paper-to-computer interfaces Paper-to-computer interfaces

2008-01-08

2008-01-08

Safaipour, Houshang (Department: 2625)

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

C358S498000, C358S474000, C358S505000

Reexamination Certificate

active

10206350

ABSTRACT:
The present invention provides an apparatus and method which facilitates the use of a printed or scribed document as an interface with a computer. The apparatus in one aspect comprises: a printed or scribed document bearing specialized calibration marks, the document being positioned on a work surface; a camera focused on the document for generating video signals representing the document in electronic form; and a processor linked to the camera for processing an image captured by the camera and configured to identify the calibration marks of the document in the captured image and then determine from the location of the calibration marks in the image a transformation between co-ordinates of features. In the image and corresponding co-ordinates of features in the document that compensates for the freely variable positioning of the document on the work surface.

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patent: 0 622 722 (1994-04-01), None
patent: 95/34046 (1995-12-01), None

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